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Charlieoneseven
Joined: 27 Jul 2019
Posts: 4
Location: Idyllwild, Ca.
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 Posted: Sat Jul 27, 2019 5:21 pm Post subject: Kolb air airworthiness directive |
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I noticed a link on the Kolb home page today leading to this.
https://kolbaircraft.com/FirestarAD.htm
Has anyone installed this?
My plane has a metal bracket welded to the frame and bolt in the general area this new part completely covers it.
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Firestar 1 1987 |
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Charlieoneseven
Joined: 27 Jul 2019
Posts: 4
Location: Idyllwild, Ca.
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| Posted: Sat Jul 27, 2019 8:23 pm Post subject: Re: Kolb air airworthiness directive |
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My brace.
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_________________
Firestar 1 1987 |
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wakataka
Joined: 11 Aug 2012
Posts: 48
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| Posted: Mon Aug 12, 2019 4:24 pm Post subject: Re: Kolb air airworthiness directive |
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I just received the parts and am in the process of installing them. The parts do the same job as that welded brace on your plane, so you should be good, assuming that both bellcranks have a similar brace as in the photo. Your brace is at least as strong as the the ones provided in the kit from Kolb.
My plane has no braces attached to the end of the bellcrank pivot bolts. I can see how the bolt or the weld could be weakened over time due to the repeated bending loads from the bellcrank.
The kit from Kolb includes two braces and the pop rivets needed to attach them to the root tube. The rivet holes are not drilled in the braces. One of the braces needed to be modified with a rotary file in order to fit on my 1985 Firestar. On my airframe, there's a little piece of tubing that secures the fuel tank welded about 3/4" away from the aileron bell crank. The new bracket needs to be filed down by at least 1/4" in order to clear the fuel tank brace tube. I think I can make the Kolb bracket work. If not, I guess I'll weld on a bracket like yours.
I applaud Kolb for taking the initiative to identify and engineer a fix for this problem.
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There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact.
Mark Twain |
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jhauck36(at)outlook.com
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| Posted: Tue Aug 13, 2019 4:22 am Post subject: Kolb air airworthiness directive |
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I was concerned when I got my FS kit, late 1985 or early 86, to discover the butt welded pivot bolt on the aileron bell crank with no bracing. I designed a strap brace to stabilize that pivot bolt. Looked a lot like what Kolb came up with at a later date. Never had a problem with it.
john h
mkIII
Titus, Alabama
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gdhelton(at)gmail.com
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| Posted: Tue Aug 13, 2019 6:45 am Post subject: Kolb air airworthiness directive |
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I did this modification about four years ago on my original Firestar. The only thing you might have change is the castle nuts. I had to go to half castles because the welded studs( bolts ) were just a bit short. This is a must do mod. for anyone who hasn’t done it yet.
Are you back home, John?
George H.
Firestar 1986, Hirth 2702
14GDH
Mesick, Michigan
gdhelton(at)gmail.com
Sent from my iPhone
[quote] On Aug 13, 2019, at 8:21 AM, John Hauck <jhauck36(at)outlook.com> wrote:
I was concerned when I got my FS kit, late 1985 or early 86, to discover the butt welded pivot bolt on the aileron bell crank with no bracing. I designed a strap brace to stabilize that pivot bolt. Looked a lot like what Kolb came up with at a later date. Never had a problem with it.
john h
mkIII
Titus, Alabama
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